Another minor followup that we agreed to address after the integration of 8221481 (Reimplement the Legacy Socket API).
Prior to 8221481, there was just a single default SocketImpl, the "plain" socket impl. There are now two, PlainSocketImpl and NioSocketImpl, the latter being the default. The former can be selected as the default by setting the `jdk.net.usePlainSocketImpl` system property, further information an be found in the Implementation Note of `java.net.SocketImpl`. The term "plain" is mentioned in a few places in the specification of j.n.Socket and j.n.ServerSocket. These should be updated to "system-default", which is the agreed term post 8221481. src/java.base/share/classes/java/net/ServerSocket.java /** * Creates a server socket, bound to the specified port. A port number * of {@code 0} means that the port number is automatically * allocated, typically from an ephemeral port range. This port * number can then be retrieved by calling {@link #getLocalPort getLocalPort}. * <p> * The maximum queue length for incoming connection indications (a * request to connect) is set to {@code 50}. If a connection * indication arrives when the queue is full, the connection is refused. * <p> * If the application has specified a server socket factory, that * factory's {@code createSocketImpl} method is called to create - * the actual socket implementation. Otherwise a "plain" socket is created. + * the actual socket implementation. Otherwise a system-default + * {@code SocketImpl} is created. * <p> * If there is a security manager, * its {@code checkListen} method is called * with the {@code port} argument * as its argument to ensure the operation is allowed. * This could result in a SecurityException. *... */ public ServerSocket(int port) throws IOException /** * Creates a server socket and binds it to the specified local port * number, with the specified backlog. * A port number of {@code 0} means that the port number is * automatically allocated, typically from an ephemeral port range. * This port number can then be retrieved by calling * {@link #getLocalPort getLocalPort}. * <p> * The maximum queue length for incoming connection indications (a * request to connect) is set to the {@code backlog} parameter. If * a connection indication arrives when the queue is full, the * connection is refused. * <p> * If the application has specified a server socket factory, that * factory's {@code createSocketImpl} method is called to create - * the actual socket implementation. Otherwise a "plain" socket is created. + * the actual socket implementation. Otherwise a system-default + * {@code SocketImpl} is created. * <p> * ... */ public ServerSocket(int port, int backlog) throws IOException src/java.base/share/classes/java/net/Socket.java /** * Creates a stream socket and connects it to the specified port * number on the named host. * <p> * If the specified host is {@code null} it is the equivalent of * specifying the address as * {@link java.net.InetAddress#getByName InetAddress.getByName}{@code (null)}. * In other words, it is equivalent to specifying an address of the * loopback interface. </p> * <p> * If the application has specified a server socket factory, that * factory's {@code createSocketImpl} method is called to create - * the actual socket implementation. Otherwise a "plain" socket is created. + * the actual socket implementation. Otherwise a system-default + * {@code SocketImpl} is created. * <p> * If there is a security manager, its * {@code checkConnect} method is called * with the host address and {@code port} * as its arguments. This could result in a SecurityException. * * ... */ public Socket(String host, int port) throws UnknownHostException, IOException /** * Creates a stream socket and connects it to the specified port * number at the specified IP address. * <p> * If the application has specified a socket factory, that factory's * {@code createSocketImpl} method is called to create the - * actual socket implementation. Otherwise a "plain" socket is created. + * actual socket implementation. Otherwise a system-default + * {@code SocketImpl} is created. * <p> * If there is a security manager, its * {@code checkConnect} method is called * with the host address and {@code port} * as its arguments. This could result in a SecurityException. * * ... */ public Socket(InetAddress address, int port) throws IOException /** * Creates a stream socket and connects it to the specified port * number on the named host. * <p> * If the specified host is {@code null} it is the equivalent of * specifying the address as * {@link java.net.InetAddress#getByName InetAddress.getByName}{@code (null)}. * In other words, it is equivalent to specifying an address of the * loopback interface. </p> * <p> * If the stream argument is {@code true}, this creates a * stream socket. If the stream argument is {@code false}, it * creates a datagram socket. * <p> * If the application has specified a server socket factory, that * factory's {@code createSocketImpl} method is called to create - * the actual socket implementation. Otherwise a "plain" socket is created. + * the actual socket implementation.Otherwise a system-default + * {@code SocketImpl} is created. * <p> * If there is a security manager, its * {@code checkConnect} method is called * with the host address and {@code port} * as its arguments. This could result in a SecurityException. * <p> * If a UDP socket is used, TCP/IP related socket options will not apply. * * ... */ @Deprecated public Socket(String host, int port, boolean stream) /** * Creates a socket and connects it to the specified port number at * the specified IP address. * <p> * If the stream argument is {@code true}, this creates a * stream socket. If the stream argument is {@code false}, it * creates a datagram socket. * <p> * If the application has specified a server socket factory, that * factory's {@code createSocketImpl} method is called to create - * the actual socket implementation. Otherwise a "plain" socket is created. + * the actual socket implementation. Otherwise a system-default + * {@code SocketImpl} is created. * * <p>If there is a security manager, its * {@code checkConnect} method is called * with {@code host.getHostAddress()} and {@code port} * as its arguments. This could result in a SecurityException. * <p> * If UDP socket is used, TCP/IP related socket options will not apply. * * ... */ @Deprecated public Socket(InetAddress host, int port, boolean stream) -Chris.